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I'm not entirely sure but this seems correct because if one photon needs a certain amount of energy to emit one electron, then the next photon would need that same amount of energy to emit the next electron, making the total energy double in the end.
No, increasing frequency of the light does not change the number of electrons ejected from a metal surface. Once the minimum frequency required to eject an electron is met, other electrons will be ejected as long as the frequency stays at that threshold level or above it. In order to eject more electrons, the intensity would need to increase in order for the light to admit more photons to interact with the electrons.
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